Reversing valve



PatentedMar. 17, 1925.

Unirse STATES Partnr orricr..

HAAKON HELLAN, or nnnnrvvoon, PENNSYLVANIA.

REVERSING VALVE.

Application lecl August 29, 1924. Serial No. 734,881.

'To all whom t may concern.'

Be it known that I, HAAKON l-IELLAN, a citizen o t the Inited Sta-tes. residing at Brentwood, in the count-y of Allegheny and State o1 Pennsylvania, have invented `new and useful Improvements in Reversing lalves, of which the following is a speciiication.

My invention relates to reversing valves of the mushroom type for regenerative furnaces. The principal object of this invention is to provide means yfor closing the valve against gas or air, and to provide means :for a positive stroke of the valve proper.

Referring to the accompanying drawing, Fig. 1 is a vertical section, parts being in elevation, showing one embodiment of" my invention; Fig. 2, a vertical section showing a modified form of the ring; and Fig. 3, a :fragmentary view showing thevalve proper and the said ring.

On the drawing. I show a `single gas-controlling structure having the upper or inlet box 1S and the lower or outlet boX 19 separated by the annular open topped water trough 14.-, on the inner wall of which is hung the metal ring 18, having an outer annular downwardly-extending flange 20, project-ing into the trough to forni a seal. The ring 13 has its inner portion tapered downwardly, its lower end forming a seat 21 for the upper portion of the valve body 1- when the latter is drawn upwardly by its stem 6 sufficiently.

2 is a port leading from the box 19 toward a suitable furnace chamber, not shown, and 3 is a passage leading exhaust gases from the box 19 toward the stack, not shown. The top of the passage 3 is provided with an annular water-cooled seat adapted to be closed by the valve-body a when in its lowest position, as shown in Fig. i. When the valve-body -1 is on its seat 21 the waste gases from. the furnace pass through the port 2, the seat 5 and the passage 3. e

The upperface of the valve-body may have an annular depression or trough 22 to receive the lower end of the ring 13. Tar condensed from the gases contacting with the valve-body and its stem, preferably constructed as shown in my Patent No. 1,499,- O17, granted June 24.-, 1924, gathers in the trough 22 and forms a seal between the ring and the valve-body.

In Fig. 2. I show a modified -form of ring. It has the flange 2O as the ring 18 has.- It has a; valve seat 21.a similar to the seat 21. From the inner edge of the seat 21a, the ring has the astending annular wall 23 spaced 'from the outer wall 16 to form an annulail water trough 24. The wall 23 is continued` up abovethe top o1 the trough and flares out over the same to form a cover or shield for the water in the trough. This shield is preferably separable from the rest of the ring. vWater is admitted to the trough 2dby the pipe 17, the overflow from the trough dropping into the trough 14, whence it escapes through the pipe 25. .In the construction shown in Fig. 1 water may be constantly supplied by any suitable well-known means.

In order to cause the stem 6 to move in a straight line, I provide two intermeshing spur-gears 11 driven by the pinion 12. Each gear has a. crank-pin 10, each directly below the center of its gear when the valven body L1 is on its seat 5. Each crank-pin has a link 9 ofl equal length whose lower ends are 'p'ivotally attached respectively to the ends of the equalizer-bar 8, loosely connected to the pin 7 pivotally connected to the upper end of the stem 6. The pin 7 has the nuts 26 above the bar 8 which engages the lower nut for the purpose of lifting the valve stein and body. The gears 11 rotate in opposite directions and cause the links to move laterally in opposite directions whereby the tendency of one link to move the Stem laterally is balanced by the contrary tendency of the other link. wear between the stem and the opening through which-it reciprocates in the top of the box 18, and prevents the valve-body from sitting skewed on its seat. 1There a slight lost motion of the bar ,8 on the pin 7 to insure lthat the stem will not be `supported by the bar at the times when ythe valigabody' should be on its seat 5. ofthe bar causes the valve-body to engage the seat 21'. In case the valve body hasv overtraveled upwardlybeyond the distance required to seat the valve body properly against its seat 21, the valve body will lift the ring, but the seal will not be broken because the flange and the trough 1/1 have sufficient depth to allow the flange to move upwardly reasonable distances without lift-. ing the fla-nge out of the water in the trough.

The crank-pins 10 may he described as This prevents The upward 'travel CJI nml

being arranged so that they shall both be .in alinenient with the centers of both gears ll when the crank-pins are ninety degrees 'from their positions shown in Fig. l, both pins being either betrveenmthe gears or beyond the sanie.

l claim*- l. ln a valve structure, a gas-inlet boX, a gas-outlet box, an annular liquid-holding trough between the bones, a valve seat loosely' hung .on the trough and having an annular llange'in the trough, and a valve body movable upwardly .into engagement with the seat.

2. In a valve strueture, a gas-inlet box, a. gas-outlet box, `an annular liquid-holding trough .between the boxes, a loosely suspended valve seat and having an annular flange in the trough, and a valve body niovable upwardly into engagement with the seat.

3. An annular valve seat for furnaees an interior downwardly extending portion `coniprising an upwardly open trough With a valve seat at its lower end and a removable cover over the trough.

4. An annular valve seat for furnaces having an outer annular sealing Harige, and an interior downwardly extending portion comprising an upwardly open trough with a valve seat at its lower end and a cover over the trough.

5. In a valve structure, a reciproeable -valve' st eni, a pair of nterrneshed equal gears, means for driving them, crank-pins,

one for each gear, .arranged to be, at certain positions of the gears, 1n alineinent with the .renters of both. gears and between the saine,

an equalizer bar pixiotally connected to the links, and means connecting the valve stem to the bar.

In testimony whereof l hereunto alii); my signaturethis 28th day of August, 1924.

HAAKON HELLAN. 

